#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#include<windows.h> 
#define High 15
#define Width 20
int ball_x,ball_y;
int ball_vx,ball_vy;
int canvas[High][Width] = {0};
void gotoxy(int x,int y)
{
	HANDLE handle = GetStdHandle(STD_OUTPUT_HANDLE);
	COORD pos;
	pos.X = x;
	pos.Y = y;
	SetConsoleCursorPosition(handle,pos); 
}
void startup()
{
	ball_x = 0;
	ball_y = Width/2;
	ball_vx = 1;
	ball_vy = 1;
	canvas[ball_x][ball_y] = 1;
}
void show()
{
	gotoxy(0,0);
	int i,j;
	for(i=0;i<High;i++)
	{
		for(j=0;j<Width;j++)
		{
			if(canvas[i][j] == 0)
			    printf(" ");
			else if(canvas[i][j] == 1)
			    printf("0");
		}
			printf("|\n");
	}
	for(j=0;j<Width;j++)
	    printf("-");
}
void updateWithoutInput()
{
	canvas[ball_x][ball_y] = 0;
	ball_x = ball_x + ball_vx;
	ball_y = ball_y + ball_vy;
	if((ball_x==0)||(ball_x==High-1))
	    ball_vx = -ball_vx;
	if((ball_x==0)||(ball_y==Width-1))
	    ball_vy = -ball_vy;
	canvas[ball_x][ball_y] = 1;
}
void updateWithInput()
{
}
int main()
{
	startup();
	while(1)
	{
		show();
		updateWithoutInput();
		updateWithInput();
	}
	return 0;
}
